User manual MARTIN AUDIO M3 SCHEMATICS

[. . . ] Always operate the amplifier with the chassis ground wire connected to the electrical safety earth. Do not parallel or series connect an amplifier output with any other amplifier output. Do not connect the amplifier output to any other voltage source, such as battery, mains source or power supply, regardless of whether the amplifier is turned on or off. Do not run the output of any amplifier back into another channel's input. [. . . ] Power rating at 1kHz and 1% THD. Table 2. MLSTM positions can be different for each channel and a variety of combinations can be achieved see Table 3. The way to find the best MLSTM position for your application is by experimentation using table 3 for initial starting positions. The amplifier is very well protected (even down to 0. 3 ohms), but where speed is of essence stick to the fixed positions. The M3 amplifier is a power converter and when you select MLSTM positions you are allocating a portion of power from 5000 watts. Channel A B A B A B A B Impedance 8 8 4 4 8 2 8 4 MLS -2dB -2dB 0dB 0dB 0dB -5dB -2dB 0dB Power 820W 820W 2100W 2100W 1300W 1660W 820W 2100W Comments Power reduction High peak power Power matching Power sharing Table 3. 12 Martin Audio ­ M3 Power Amplifier CONTENTS < > ENGLISH PRINT APPLICATIONS GUIDE GUIDES OUTPUT CH. B MLS Switch 1+ CH. B+ 1­ CH. B­ -2 -4 -5 Figure 10. MLS switches on rear panel 6 OPERATION MODES 6. 1 Stereo operation For stereo (dual channel) operation, leave the Link and Phase reverse switches in the un-depressed position. In this mode, both channels operate independently of each other, with their level attenuators controlling their respective levels. Never connect either output terminal to ground or in parallel. The recommended minimum nominal impedance for stereo or tandem operation, is 2 ohms per channel. 6. 2 Tandem mono For tandem (dual channel-single input) operation, depress the Link switch. Both channels can now be driven by a signal at either input connector. The output connection is the same as in stereo mode. See pages 6-8 about operating voltage and power consumption. · Make sure that the switches on the rear panel for operation modes, clip limiters and the MLSTM switches are in the correct position. See pages 13 and 14 about operation modes, page 16 about clip limiters and page 12 for the MLS switches. · It is always a good idea to turn down the gain controls during power up as this prevents speaker damage, especially if there is a high level signal at the input. 7. 2 Powering up - Soft start When you power up the amplifier it takes a couple of seconds to self check. This is known as the "soft start" or "slow start" sequence. The fans then blow at high speed before going into "idle" and the two bottom green LED's illuminate to show the amplifier is operational. 7. 3 Input attenuators The two input level attenuators on the front panel adjust the signal level for their respective amplifier channel in all modes. They are calibrated in dB to assist setting up active loudspeaker systems. In bridged mode, both controls must be in the same position, so that the speaker load will be shared equally between the channels. 7. 4 Gain switch The gain switch located on the rear panel is for changing the input sensitivity of the amplifier. [. . . ] If the -40dB LED is functioning there is nothing wrong with the amplifier and the likely cause is an unsecured Speakon. Check that the VHF protection is not activated. If it is, remove possible high frequency oscillations from the relevant input. Fault: The amplifier goes into thermal protection when driven at low level. [. . . ]